Java - Throwable to Exception

Question

I am currently using the play2 framework.

I have several classes which are throwing exceptions but play2s global onError handler uses throwable

Answer 1

Can I check a throwable object if it is a NoSessionException ?

Sure:

Throwable t = ...;
if (t instanceof NoSessionException) {
    ...
    // If you need to use information in the exception
    // you can cast it in here
}